Allocated but unannounced space
Every block here was allocated or assigned by a regional internet registry, and none of them appeared in any routing table we collected at our last snapshot — neither as a route of their own, nor covered by a larger announcement, nor carved up into more specifics.
“Unannounced” does not mean “unused”
Plenty of allocated space is deliberately kept off the public internet: private interconnects, lab and lawful-intercept ranges, networks reachable only inside one operator, and space held in reserve. Some of it is announced somewhere our collectors cannot see, which is a limit of our vantage points rather than a fact about the block.
It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today. Nothing on this page means a block is unallocated, available, or free to announce.
Browse by registry
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,195 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.76.118.0/23 | 512 | RIPE NCC |  US | 21st Nov 2014 |
| 192.76.121.0/24 | 256 | ARIN | US | 26th Mar 1990 |
| 192.76.123.0/24 | 256 | RIPE NCC |  DE | 17th Sept 1990 |
| 192.76.125.0/24 | 256 | RIPE NCC | DE | 2nd May 1994 |
| 192.76.126.0/24 | 256 | RIPE NCC | DE | 17th Sept 1990 |
| 192.76.127.0/24 | 256 | RIPE NCC | DE | 17th Sept 1990 |
| 192.76.128.0/24 | 256 | RIPE NCC | DE | 17th Sept 1990 |
| 192.76.130.0/24 | 256 | RIPE NCC | DE | 17th Sept 1990 |
| 192.76.131.0/24 | 256 | RIPE NCC | DE | 17th Sept 1990 |
| 192.76.132.0/24 | 256 | RIPE NCC | DE | 17th Sept 1990 |
| 192.76.136.0/24 | 256 | RIPE NCC | DE | 17th Sept 1990 |
| 192.76.139.0/24 | 256 | RIPE NCC | DE | 17th Sept 1990 |
| 192.76.140.0/24 | 256 | RIPE NCC | DE | 6th Jun 1996 |
| 192.76.141.0/24 | 256 | RIPE NCC | DE | 8th Jun 1992 |
| 192.76.142.0/24 | 256 | RIPE NCC | DE | 17th Sept 1990 |
| 192.76.143.0/24 | 256 | RIPE NCC | DE | 17th Sept 1990 |
| 192.76.149.0/24 | 256 | RIPE NCC |  GB | 12th Nov 2019 |
| 192.76.152.0/24 | 256 | RIPE NCC | DE | 17th Sept 1990 |
| 192.76.155.0/24 | 256 | RIPE NCC | DE | 17th Sept 1990 |
| 192.76.156.0/24 | 256 | RIPE NCC | DE | 17th Sept 1990 |
| 192.76.159.0/24 | 256 | RIPE NCC | DE | 17th Sept 1990 |
| 192.76.165.0/24 | 256 | RIPE NCC | DE | 17th Sept 1990 |
| 192.76.170.0/24 | 256 | RIPE NCC | DE | 17th Sept 1990 |
| 192.76.171.0/24 | 256 | RIPE NCC | US | 12th Nov 2019 |
| 192.76.174.0/24 | 256 | ARIN | US | 17th Sept 1990 |
| 192.76.179.0/24 | 256 | ARIN | US | 19th Sept 1990 |
| 192.76.182.0/24 | 256 | ARIN | US | 19th Sept 1990 |
| 192.76.183.0/24 | 256 | ARIN | US | 19th Sept 1990 |
| 192.76.184.0/24 | 256 | ARIN | US | 19th Sept 1990 |
| 192.76.186.0/24 | 256 | ARIN | US | 19th Sept 1990 |
| 192.76.187.0/24 | 256 | ARIN | US | 20th Sept 1990 |
| 192.76.236.0/24 | 256 | ARIN | US | 20th Sept 1990 |
| 192.76.240.0/24 | 256 | ARIN | US | 30th Jun 1990 |
| 192.76.242.0/24 | 256 | RIPE NCC |  PT | 8th Oct 1990 |
| 192.76.244.0/24 | 256 | RIPE NCC |  AT | 8th Oct 1990 |
| 192.76.250.0/24 | 256 | ARIN | US | 9th Oct 1990 |
| 192.76.251.0/24 | 256 | ARIN | US | 30th Jun 1990 |
| 192.76.252.0/23 | 512 | APNIC |  JP | 3rd Feb 2011 |
| 192.76.36.0/22 | 1k | ARIN | US | 28th Aug 1990 |
| 192.76.40.0/21 | 2k | ARIN | US | 28th Aug 1990 |
| 192.76.96.0/20 | 4.1k | ARIN | US | 28th Aug 1990 |
| 192.77.1.0/24 | 256 | ARIN | US | 30th Jun 1990 |
| 192.77.109.0/24 | 256 | ARIN | US | 14th Aug 1991 |
| 192.77.11.0/24 | 256 | RIPE NCC |  CH | 17th Oct 1990 |
| 192.77.112.0/24 | 256 | ARIN | US | 15th Aug 1991 |
| 192.77.118.0/24 | 256 | ARIN | US | 21st Aug 1991 |
| 192.77.119.0/24 | 256 | ARIN | US | 22nd Aug 1991 |
| 192.77.124.0/24 | 256 | ARIN | US | 22nd Aug 1991 |
| 192.77.127.0/24 | 256 | ARIN | US | 22nd Aug 1991 |
| 192.77.128.0/24 | 256 | ARIN | US | 31st Dec 2014 |